How to scroll to middle of page (with jquery)

Hello experts
I 'm using a function to add a new div onclick loading the content with an ajax call.
The problem is that i cant scroll the new div to the middle of the page.
Below my code.
Any help to fix this?
// JavaScript Document
 $('#adddiv').live('click', function () {
   $.ajax({
     type: "POST",
     url: "thisfunction.cfc?returnformat=json",
     data: {
       method: 'fgetinstruction'
     },
     success: function (f) {
       var formattedResponse = $.parseJSON(f);
       if (jQuery.isArray(formattedResponse) === true) {
         var success = formattedResponse[0]['success'];
         var content = formattedResponse[0]['content'];
         var newid = formattedResponse[0]['newid'];
         if (success === true) {
           $(content).appendTo(instruc);
           $('#' + newid).scrolltocenter();
           return false;
         }
       }
     }
   }, "json")
 });
 jQuery.fn.scrolltocenter = function () {
   var scrollto = this.offset().top + (this.height() / 2);
   this.animate({
     scrollTop: scrollto
   });
   return this;
 }

Open in new window

LVL 2
PanosAsked:
Who is Participating?
 
Julian HansenConnect With a Mentor Commented:
Firstup consider changing .live() to .on() - the former is being deprecated.

Secondly - set your dataType : 'json' - that way you won't have to use this line

var formattedResponse = $.parseJSON(f);

As you have it at the moment is the method used for .post() i.e. to add the 'json' parameter after the definition of the callback.

For .ajax use
type: "POST",
     url: "thisfunction.cfc?returnformat=json",
     data: {
       method: 'fgetinstruction'
     },
     dataType: 'json',
     success: 
...
}

Open in new window

Then to your actual problem
1. You need to subtract from offset top not add
2. The value you need to subtract is half the difference between the window height and the height of your div
3. Finally - you need to scroll the body not the div
Here is some code that should do what you want
 jQuery.fn.scrolltocenter = function () {
   var scrollto = this.offset().top - (($(window).height() - this.height())/ 2);
   $('html,body').animate({
     scrollTop: scrollto
   });
   return this;
 }

Open in new window

0
 
PanosAuthor Commented:
Hi  julianH
Thank you for your correction and the great help.
It is working fine
0
 
PanosAuthor Commented:
Thank you
regards
panos
0
 
Julian HansenCommented:
You are welcome - thanks for the points.
0
All Courses

From novice to tech pro — start learning today.